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Exception saat menyimpan editan row yang tidak ada

Jika tidak ada row pada tamuTable [JTable] yang terpilih, dan tombol edit di-klik. Maka pada saat penyimpanan akan muncul eksepsi.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at com.mysql.jdbc.UpdatableResultSet.syncUpdate(UpdatableResultSet.java:1550)
    at com.mysql.jdbc.UpdatableResultSet.updateString(UpdatableResultSet.java:2490)
    at hotel.TamuJFrame_TabelModel.editButtonActionPerformed(TamuJFrame_TabelModel.java:315)
    at hotel.TamuJFrame_TabelModel.access$100(TamuJFrame_TabelModel.java:20)
    at hotel.TamuJFrame_TabelModel$2.actionPerformed(TamuJFrame_TabelModel.java:173)
        ...
        ...
        ...

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